Laima Skalbe, commander of Group U, a special unit of the security service that carries out missions of special secrecy, decided to put an end to her life full of dangers and adventures and get married. A young, handsome, wealthy man proposed to her - and she said yes. But the agent can’t just leave the game! The fearless commander of group “U” was literally kidnapped from his wedding in order to be assigned a new task. Laima, as well as her faithful assistants - former paratrooper Ivan Medved and network guru Evgeny Korneev - go to the city of Chistoretsk, where a folk music festival is taking place. Terrorists should arrive here under the guise of guests, who are interested in three scientists working on a secret project at the Institute of Nanotechnology. For the purpose of deep secrecy, the fighters of the group “U” decide to take part in an international music competition and turn into the folk ensemble “Clockwork Matryoshkas”...